Rack type electric power steering system

Abstract

The present invention relates to a rack type electric power steering system. The present invention provides a rack type electric power steering system including: a power steering motor comprising a motor housing accommodating a rotor to which a motor shaft is coupled and a stator accommodating the rotor therein, and a front cover having a shaft through-hole for protruding a distal end of the motor shaft to the outside at a portion thereof and coupled to the motor housing such that an inner surface thereof faces the interior of the motor housing; a moisture detection sensor attached to a lower end of an inner surface of the front cover, which is adjacent to the shaft through-hole; and a controller for, if receiving a moisture detection signal of a predetermined value or higher from the moisture detection sensor, stopping driving of the power steering motor.

What is claimed is: 
     
         1 . A rack type electric power steering system comprising:
 a power steering motor comprising a motor housing accommodating a rotor to which a motor shaft is coupled and a stator accommodating the rotor therein, and a front cover having a shaft through-hole for protruding a distal end of the motor shaft to the outside at a portion thereof and coupled to the motor housing such that an inner surface thereof faces the interior of the motor housing;   a moisture detection sensor attached to a lower end of an inner surface of the front cover, which is adjacent to the shaft through-hole; and   a controller for, if receiving a moisture detection signal of a predetermined value or higher from the moisture detection sensor, stopping driving of the power steering motor.   
     
     
         2 . The rack type electric power steering system of  claim 1 , further comprising a signal line for a moisture detection sensor connecting the moisture detection sensor and the controller, extending towards the rear end of the motor housing through a bottom surface of the interior of the motor housing while one end thereof is electrically connected to the moisture detection sensor, and of which an opposite end is extracted from the rear end of the motor housing to be electrically connected to the controller. 
     
     
         3 . The rack type electric power steering system of  claim 1 , wherein a first rib and a second rib coupled to opposite ends of the moisture detection sensor to fix the moisture detection sensor are formed at the lower end of an inner surface of the front cover. 
     
     
         4 . The rack type electric power steering system of  claim 3 , wherein coupling recesses for slidably coupling opposite ends of the moisture detection sensor to the first rib and the second rib are formed surface of the first rib and the second rib. 
     
     
         5 . The rack type electric power steering system of  claim 1 , wherein if receiving a moisture detection signal of a predetermined value or lower from the moisture detection signal, the controller generates an alarm signal signifying the detection of moisture and maintains driving of the power steering motor. 
     
     
         6 . A rack type electric power steering system comprising:
 a power steering motor comprising a motor housing accommodating a stator and a rotor and an Hall IC substrate attached to the rear end of the motor housing;   a moisture detection sensor attached to a portion of the Hall IC substrate; and   a controller for, if receiving a moisture detection signal of a predetermined value or higher from the moisture detection sensor, stopping driving of the power steering motor.   
     
     
         7 . The rack type electric power steering system of  claim 6 , wherein if receiving a moisture detection signal of a predetermined value or lower from the moisture detection signal, the controller generates an alarm signal signifying the detection of moisture and maintains driving of the power steering motor.